A push-type blood collection needle

Abstract

A push-type blood collection needle comprises a housing (1), a sliding sleeve (2), a needle core (3) and a first spring (4); a needle outlet is formed at the lower end of the housing (1); an upper cover (5) is detachably connected to the upper end; the sliding sleeve (2) can slide in the housing (1) and the lower end can extend from the needle outlet to the outside of the housing (1); a needle head is provided at the lower end of the needle core (3) and can slide relative to the sliding sleeve (2) to expose the needle head at the needle outlet. A first channel (11) and a second channel (12) are provided in the housing (1) and are mutually connected and coaxially arranged from bottom to top. The sliding sleeve (2) has a plurality of strip grooves (21) extending from the upper end opening to the lower end. The strip grooves (21) provide elasticity for radial deformation for the side wall of the sliding sleeve located at the upper end. The side wall of the needle core (3) extends outwardly with at least one slider (31) abutting against the upper end of the side wall of the sliding sleeve. When the sliding sleeve (2) is located in the first channel (11), the slider (31) abuts against the upper end of the side wall of the sliding sleeve (2). When the sliding sleeve (2) moves into the second channel (12) under the action of an external force, the outer wall of the sliding sleeve (2) expands under the pressure of the slider (31), and the needle core (3) slides in the sliding sleeve (2) under the action of a first spring (4) and pierces the needle outlet. The push-type blood collection needle with this arrangement is easy to assemble, stable in firing, and has a good blood collection effect.

Description

Technical Field

[0001] The invention relates to a pressing type blood collection needle. Background Art

[0002] In the field of medical blood collection, disposable blood collection devices are popular among medical staff and patients for their small size, safe use and convenient operation. They are currently widely used in various medical institutions and among diabetic patients. This type of blood collection device has a built-in ejection mechanism, a compact structure, and is disposable as a whole. It is safe and convenient, so it has strong market development potential.

[0003] The scheme adopted by the existing blood collection needles is generally to press the sliding sleeve that is in direct contact with the patient's skin to make the needle core ejected under the action of the spring, and then use the needle tip to pierce the skin end to collect blood. However, the needle core of the existing blood collection needle is not stable in ejection, which can easily cause the needle tip to deviate, the ejection force to be reduced or excessive, resulting in abnormal blood collection and causing harm to the patient. Summary of the invention

[0004] In order to overcome the above-mentioned shortcomings, the purpose of the present invention is to provide a push-type blood collection needle with a simple structure, easy assembly, stable needle core emission and good blood collection effect.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: a push-type blood collection needle, including a shell, a sliding sleeve, a needle core and a first spring, the lower end of the shell forms a needle outlet, and an upper cover is detachably connected to the upper end, the sliding sleeve can slide in the shell and the lower end can extend from the needle outlet to the outside of the shell, the lower end of the needle core is provided with a needle head, and can slide relative to the sliding sleeve to expose the needle head at the needle outlet, one end of the first spring abuts against the needle core, and the other end abuts against the upper cover, characterized in that: a first channel and a second channel are arranged in the shell, which are mutually conductive and coaxially connected from bottom to top, and the first spring is provided with a first channel and a second channel are provided in the shell, and the first channel is provided with a first channel and a second channel are provided in the shell, and the first channel and the ... The cross-sectional area of ​​the first channel is smaller than that of the second channel. The sleeve has a plurality of strip grooves extending from the upper opening to the lower end. The strip grooves provide elasticity for the side wall of the sleeve located at the upper end to deform radially outward. The side wall of the needle core extends outward with at least one slider abutting against the upper end of the side wall of the sleeve. When the sleeve is located in the first channel, the slider abuts against the upper end of the side wall of the sleeve. When the sleeve moves into the second channel under the action of external force, the outer wall of the sleeve expands under the pressure of the slider, and the needle core slides in the sleeve under the action of the first spring and pierces the needle outlet.

[0006] The beneficial effect of the present invention is that: initially, the lower end of the sliding sleeve extends out of the needle outlet, and the sliding sleeve is located in the first channel, the cross-sectional area of ​​the first channel matches the cross-sectional area of ​​the sliding sleeve, the side wall of the sliding sleeve is in a free state, and the slider of the needle core abuts against the upper end of the side wall of the sliding sleeve. However, when blood sampling is required, the lower section of the sliding sleeve abuts against the blood sampling part, the hand-held shell is pressed downward, and the sliding sleeve moves up relative to the shell. At this time, the upper end of the sliding sleeve with a strip groove enters the second channel, and the cross-sectional area of ​​the second channel is larger than the first channel. At this time, the position of the slider remains unchanged, and the side wall of the sliding sleeve expands under the extrusion of the slider using its own elastic force, and the expanded width is greater than the distance between the sliders. The needle core falls into the inner cavity of the sliding sleeve, and slides quickly under the action of the first spring and pierces the needle outlet to complete blood sampling. Through the arrangement of the strip groove, the first channel and the second channel, the sliding sleeve itself has a radial deformation elasticity, which is convenient for limiting the needle core and realizing the rapid and stable ejection of the needle core. And the structure is simple and easy to assemble.

[0007] Furthermore, the first channel and the second channel have the same shape, and the connection between the first channel and the second channel is stepped, the sliding sleeve includes an expansion sleeve portion and a pressing portion which are integrally formed and arranged up and down, the pressing portion can extend to the outside of the shell, the expansion sleeve portion matches the first channel, and the strip groove is arranged on the expansion sleeve portion. The pressing portion is convenient for abutting against the blood collection point, and the expansion sleeve portion is in a free state in the first channel, which is convenient for the slider to abut against.

[0008] Furthermore, the cross-sections of the first channel and the second channel are both rectangular, and the cross-section length of the first channel is smaller than the cross-section length of the second channel, so as to prevent the sliding sleeve from rotating and make the sliding of the sliding sleeve more stable.

[0009] Furthermore, the side wall of the expansion sleeve is also provided with a slide groove corresponding to the slider and for the slider to slide, and the slide groove is two and symmetrically arranged on the side wall of the expansion sleeve. The slide groove guides the slider so that the needle core slides vertically along the slide groove.

[0010] Furthermore, the side wall of the expansion sleeve is also provided with a limiting groove corresponding to the slide groove, the limiting groove is opened downward along the upper end opening of the side wall of the expansion sleeve, and the slider is embedded in the limiting groove, so as to facilitate the fixing of the slider in the initial state.

[0011] Furthermore, the side wall of the first channel is also provided with a guide ridge corresponding to the slide groove, and the slide groove slides up and down along the guide ridge, and the guide ridge plays a guiding role to improve the stability of the sliding sleeve when sliding up and down.

[0012] Furthermore, the outer wall of the needle core extends outward with a mounting protrusion, and the mounting protrusion is located at the upper end of the slider. One end of the first spring is sleeved on the needle core and abuts against the mounting protrusion. The upper cover is provided with an annular groove for the other end of the first spring to be embedded.

[0013] Furthermore, a return spring is included, which is sleeved on the needle core with an interference fit, and the other end can abut against the lower opening of the sliding sleeve, and the return spring is in a compressed state when the needle core is exposed from the needle hole. After blood collection is completed, the needle head quickly moves up and retracts into the pressing part under the action of the return spring, thereby improving safety.

[0014] Furthermore, it also includes a protection component, which includes a needle sleeve that is sleeved on the needle head, the lower end of the needle sleeve extends out of the needle outlet and is sleeved with a protection sleeve, and the upper end of the protection sleeve abuts against the housing to protect the needle head and prevent misoperation from causing harm to personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 An exploded view of an embodiment of the present invention;

[0016] Figure 2 It is a cross-sectional view of an initial state of an embodiment of the present invention;

[0017] Figure 3 A cross-sectional view of a blood sampling state of an embodiment of the present invention;

[0018] Figure 4 A schematic structural diagram of a sliding sleeve in an embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the structure of the needle core in an embodiment of the present invention;

[0020] Figure 6 4 is a cross-sectional view of a housing in an embodiment of the present invention.

[0021] In the figure:

[0022] 1. Shell; 11. First channel; 111. Guide convex strip; 12. Second channel; 2. Sliding sleeve; 21. Strip groove; 22. Expanding sleeve portion; 221. Sliding groove; 222. Limiting groove; 23. Pressing portion; 3. Needle core; 31. Sliding block; 32. Mounting protrusion; 4. First spring; 5. Upper cover; 6. Reset spring; 7. Needle sleeve; 8. Protective sleeve. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0024] Example

[0025] See attached Figure 1-6As shown, a push-type blood collection needle comprises a housing 1, a sleeve 2, a needle core 3 and a first spring 4, wherein the housing 1, the sleeve 2 and the needle core 3 are all integrally formed injection molded parts. A needle outlet is formed at the lower end of the housing 1, and a top cover 5 is detachably connected to the upper end. The sleeve 2 can slide in the housing 1 and the lower end can extend from the needle outlet to the outside of the housing 1. A needle head is provided at the lower end of the needle core 3, and can slide relative to the sleeve 2 to expose the needle head at the needle outlet. One end of the first spring 4 abuts against the needle core 3, and the other end abuts against the top cover 5. In the initial state of the blood collection needle, i.e. when not in use, the first spring 4 is in a compressed state, so that the needle core 3 rushes out of the needle outlet under the elastic force of the first spring 4. A protective assembly is also included, wherein the protective assembly comprises a needle sleeve 7 which is sleeved on the needle head by interference, the lower end of the needle sleeve 7 extends out of the needle outlet and is sleeved with a protective sleeve 8, and the upper end of the protective sleeve 8 abuts against the housing 1.

[0026] The housing 1 is provided with a first channel 11 and a second channel 12 which are mutually connected and coaxially arranged from bottom to top, and the cross-sectional area of ​​the first channel 11 is smaller than the cross-sectional area of ​​the second channel 12. The first channel 11 and the second channel 12 have the same shape, and the connection between the first channel 11 and the second channel 12 is stepped. The cross-sections of the first channel 11 and the second channel 12 are both rectangular, and the cross-sectional length of the first channel 11 is smaller than the cross-sectional length of the second channel 12, so that the sliding of the sliding sleeve 2 is more stable and the sliding sleeve 2 is prevented from rotating in the first channel 11 or the second channel 12. The first channel 11 and the second channel 12 can also be circular or square, as long as the cross-sectional area of ​​the first channel 11 is smaller than the cross-sectional area of ​​the second channel 12. The sliding sleeve 2 can slide between the first channel 11 and the second channel 12.

[0027] A third slideway for the needle core 3 to slide is provided in the sliding sleeve 2. The sliding sleeve 2 has a plurality of strip grooves 21 extending from the upper opening to the lower end. The strip grooves 21 provide elasticity for the side wall of the sliding sleeve 2 located at the upper end to deform radially outward. The sliding sleeve 2 includes an expanding sleeve portion 22 and a pressing portion 23 which are integrally formed and arranged up and down. The pressing portion 23 can extend to the outside of the housing 1. The expanding sleeve portion 22 matches the first channel 11 and the strip grooves 21 are arranged in the expanding sleeve portion 22. When the expanding sleeve portion 22 is in the first channel 11, it is in a free state, and the distance between the side walls of the sliding sleeve 2 is slightly smaller than the distance between the sliders 31. The pressing portion 23 is convenient for abutting against the blood collection site, and the expanding sleeve portion 22 is convenient for abutting against the slider 31. When the expanding sleeve 22 enters the second slide under the action of external force, the outer wall of the expanding sleeve 22 expands under the pressure of the slider 31 and uses its own elastic force, and the upper opening of the sliding sleeve 2 becomes larger. At this time, the distance between the sliders 31 is smaller than the size of the upper opening of the sliding sleeve 2, and the slider 31 can enter the sliding sleeve 2 and slide.

[0028] The side wall of the needle core 3 extends outward to form at least one slider 31 which abuts against the upper end of the side wall of the sliding sleeve 2. When the sliding sleeve 2 is located in the first channel 11, the slider 31 abuts against the upper end of the side wall of the sliding sleeve 2. When the sliding sleeve 2 moves into the second channel 12 under the action of an external force, the outer wall of the sliding sleeve 2 expands, the width of the slider 31 remains unchanged, the needle core 3 enters the third slideway of the sliding sleeve 2, and slides quickly in the sliding sleeve 2 under the action of the first spring 4 and pierces the needle outlet.

[0029] The side wall of the expansion sleeve 22 is also provided with a slide groove 221 corresponding to the slider 31 and for the slider 31 to slide. There are two slide grooves 221, which are symmetrically arranged on the side wall of the expansion sleeve 22. The slide groove 221 guides the slider 31, so that the needle core 3 slides vertically along the slide groove 221. The side wall of the expansion sleeve 22 is also provided with a limit groove 222 corresponding to the slide groove 221. The limit groove 222 is downwardly opened along the upper end opening of the side wall of the expansion sleeve 22, and the slider 31 is embedded in the limit groove 222. It is convenient for fixing the slider 31 in the initial state. The side wall of the first channel 11 is also provided with a guide ridge 111 corresponding to the slide groove 221. The slide groove 221 slides up and down along the guide ridge 111. The guide ridge 111 plays a guiding role to improve the stability of the sliding sleeve 2 sliding up and down.

[0030] The outer wall of the needle core 3 extends outward with a mounting protrusion 32, which is located at the upper end of the slider 31. One end of the first spring 4 is sleeved on the needle core 3 and abuts against the mounting protrusion 32. The upper cover 5 is provided with an annular groove for the other end of the first spring 4 to be embedded.

[0031] It also includes a return spring 6, which is sleeved on the needle core 3 with an interference fit, and the other end can abut against the lower opening of the sliding sleeve 2. The return spring 6 is in a compressed state when the needle core 3 is exposed from the needle port. The outer wall of the needle core 3 extends outward with a second mounting protrusion 32, and one end of the return spring 6 is sleeved outside the needle core 3 and abuts against the second mounting protrusion 32, and the second mounting protrusion 32 is located at the lower end of the slider 31. The return spring 6 is in a compressed state when the needle core 3 is exposed from the needle port. In the initial state, the return spring 6 does not abut against the sliding sleeve 2 and is in a free state, at which time the lower end is suspended. After the blood collection is completed, the needle tip quickly moves up and retracts into the pressing portion 23 under the action of the return spring 6 to improve safety.

[0032] During assembly, first insert the sleeve 2 into the housing from top to bottom, and the entire sleeve 2 enters the first channel 11. Then put the reset spring 6 on the front end of the needle core 3, and insert the needle core 3 into the sleeve 2 from top to bottom until the slider 31 on the needle core 3 abuts against the limit groove 222. Put the first spring 4 on the needle core 3, and put on the upper cover 5, and finally insert the needle sleeve 7 from the needle outlet and cover it with the protective cover 8 to complete the assembly. Initially, the lower end of the sleeve 2 extends out of the needle outlet. At this time, the sleeve 2 is located in the first channel 11. The cross-sectional area of ​​the first channel 11 is the same as that of the sleeve 2. The side wall of the sleeve 2 is in a free state, and the slider 31 of the needle core 3 abuts against the upper end of the side wall of the sleeve 2. However, when blood sampling is required, the needle sleeve 7 and the protective sleeve 8 are removed, the lower section of the sleeve 2 is pressed against the blood sampling part, the housing 1 is held and pressed downward, and the sleeve 2 moves upward relative to the housing 1. At this time, the upper end of the sleeve 2 with the strip groove 21 enters the second channel 12. The cross-sectional area of ​​the second channel 12 is larger than the first channel 11. At this time, the outer wall of the sleeve 2 expands by its own elastic force under the pressure of the slider 31. The width of the expanded opening is larger than the distance of the slider 31. The slider 31 enters the third slideway, and the needle core 3 falls into the third channel of the sleeve 2. Under the action of the first spring 4, it quickly slides and pierces the needle outlet to complete blood sampling. Through the strip groove 21, the sleeve 2 itself has a radial deformation elasticity, and the slider 31 is used to make the sleeve 22 of the sleeve 2 expand radially outward, which is convenient for limiting the needle core 3 and realizing the rapid and stable ejection of the needle core 3. And the structure is simple and easy to assemble.

[0033] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A push-type blood collection needle, comprising a housing (1), a sliding sleeve (2), a needle core (3) and a first spring (4); the housing (1) has a needle outlet formed at the lower end, and an upper cover (5) is detachably connected to the upper end; the sliding sleeve (2) can slide in the housing (1) and the lower end can extend from the needle outlet to the outside of the housing (1); the needle core (3) has a needle tip at the lower end and can slide relative to the sliding sleeve (2) to expose the needle tip at the needle outlet; one end of the first spring (4) abuts against the needle core (3) and the other end abuts against the upper cover (5); the needle tip is provided at the lower end of the needle core (3) ... the needle tip is provided at the lower end of the needle core (3) and can slide relative to the sliding sleeve (2) to expose the needle tip at the needle outlet; the needle tip is provided at the lower end of the needle core (3) and at the other end of the first spring (4) abuts against the needle core (3) and at the other end thereof abuts against the upper cover (5); the needle tip is provided at the lower end of the needle core (3) and at the other end thereof abuts against the upper cover (5); the needle tip is provided at the lower end of the needle core (3) and at the lower end thereof abuts against the upper cover (5); the needle tip is provided at the lower end of the needle core (3) and at the lower end thereof abuts against the upper cover (5); the needle tip is provided at the lower end of the needle core (3) and at the lower end thereof abuts against the upper cover (5); the needle tip is provided at the lower end of the needle core (3) The housing (1) is provided with a first channel (11) and a second channel (12) which are interconnected from bottom to top and are coaxially arranged. The cross-sectional area of ​​the first channel (11) is smaller than the cross-sectional area of ​​the second channel (12). The sliding sleeve (2) is provided with a plurality of strip grooves (21) extending from the upper end opening to the lower end. The strip grooves (21) provide elasticity for the side wall of the sliding sleeve (2) located at the upper end to deform radially outward. The side wall of the needle core (3) is provided with at least one slider (31) which abuts against the upper end of the side wall of the sliding sleeve (2). When the sliding sleeve (2) is located in the first channel (11), the slider (31) abuts against the upper end of the side wall of the sliding sleeve (2). When the sliding sleeve (2) moves into the second channel (12) under the action of an external force, the outer wall of the sliding sleeve (2) expands under the pressure of the slider (31). The needle core (3) slides in the sliding sleeve (2) under the action of the first spring (4) and pierces the needle outlet. The first channel (11) and the second channel (12) have the same shape, and the connection between the first channel (11) and the second channel (12) is stepped. The sliding sleeve (2) comprises an expanding sleeve portion (22) and a pressing portion (23) which are integrally formed and arranged up and down. The pressing portion (23) can extend to the outside of the housing (1). The expanding sleeve portion (22) matches the first channel (11) and the strip groove (21) is arranged on the expanding sleeve portion (22). The side wall of the expansion sleeve portion (22) is further provided with a slide groove (221) corresponding to the slider (31) and for the slider (31) to slide. There are two slide grooves (221) symmetrically arranged on the side wall of the expansion sleeve portion (22). The side wall of the expansion sleeve portion (22) is further provided with a limit groove (222) corresponding to the slide groove (221). The limit groove (222) is downwardly opened along the upper end opening of the side wall of the expansion sleeve portion (22), and the slider (31) is embedded in the limit groove (222).

2. The push-type blood collection needle according to claim 1, characterized in that: The cross-sections of the first channel (11) and the second channel (12) are both rectangular, and the cross-sectional length of the first channel (11) is smaller than the cross-sectional length of the second channel (12).

3. The push-type blood collection needle according to claim 1, characterized in that: The side wall of the first channel (11) is also provided with a guide convex strip (111) arranged corresponding to the slide groove (221), and the slide groove (221) slides up and down along the guide convex strip (111).

4. The push-type blood collection needle according to claim 1, characterized in that: An outer wall of the needle core (3) extends outwardly to form a mounting protrusion (32), the mounting protrusion (32) being located at the upper end of the slider, one end of the first spring (4) being sleeved on the needle core (3) and abutting against the mounting protrusion (32), and the upper cover (5) being provided with an annular groove for the other end of the first spring (4) to be embedded.

5. A push-type blood collection needle according to any one of claims 1 to 4, characterized in that: It also includes a return spring (6), which is sleeved on the needle core (3) with an interference fit, and the other end of which can abut against the lower opening of the sliding sleeve (2). The return spring (6) is in a compressed state when the needle core (3) is exposed from the needle outlet.

6. The push-type blood collection needle according to claim 1, characterized in that: It also comprises a protection component, the protection component comprising a needle sleeve (7) which is interference-fitted onto the needle head, the lower end of the needle sleeve (7) extending out of the needle outlet and being sleeved with a protection sleeve (8), the upper end of the protection sleeve (8) being in contact with the housing (1).

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